Tommy, instead of the whole hoop thing, why not get a few light earth magnetic hooks for curtain (maybe 5 or more as desired) and then just screw or glue 5+ metal washers to the roof in circular pattern where you want to attract the magnetic hooks that hold the curtain. No more hoop!Then just stick the curtain up when you want and fold it up and put in drawer when it dries out.
You can get a fabric shower curtain similar to what I use. They dry quick and fold up small and are not stiff plastic.
Could also get a collapsible water catch for basin to eliminate blue bin.
I will edit with magnetic hooks and water catch I have in mind.
Edit.. here you go. All for $50.00. Problem solved. All portable and foldable with no hoop. Could use existing basin of course. But this one would be less confined and is flexible to fit your space. Bonus as it does fold up small for storage.
The hooks in any case solves the hoop dilemma.
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